preloader for screen-based document

I'm using Flash2004MXPro. Have created a rather large screen-based file which is in need of a preloader. I understand you can't mix scene-based and screen-based on the same document, so I'm trying to create a preloader that will work by loading the separate screen-based swf file.

I've been on the Macromedia AS forum and gone round and round trying to come up with just the right AS. The closest success has been that I created a preloader with two frames: frame 1 has a MC and the following AS:

loadMovieNum("soykaphotography2.swf", 1);
stop();
this.onEnterFrame = function ()
{
if(_level1.getBytesTotal())
return;
if (_level1.getBytesLoaded() >= _level1.getBytesTotal())
{
gotoAndStop(2);
delete this.onEnterFrame;
}
}

frame 2 is a blank keyframe.

On testing the preloader, it progresses nicely loading in the main movie, however, it won't stay on frame 1 while it's doing it. Instead it jumps immediately to frame 2 and I have a blank screen as a preloader. (Kind of defeats the purpose, eh?)

You can view what's happening at my site:

http://www.soykagraphics.com/photography/photography_home.html[/URL]

and click on "Enter Jane Soyka's Photo Gallery"

I've attached the preloader file.

Any ideas?